What Girls Said 6

I usually use it when I'm kinda flirting with a guy, and I've actually had this discussion with a friend who does the same thing. If she wanted to just say "hi," she would probably have done something like "how's it going?" or "what's up?"

Not really. You said that you had a nice time with her, so maybe she'd like to be friends. If she's interested, she'll show it in more ways than just a two word text. Look for other things too, and don't overthink it.